CN108975788A - A method of improving steam-cured complementary cementitious material/cement system intensity - Google Patents
A method of improving steam-cured complementary cementitious material/cement system intensity Download PDFInfo
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- CN108975788A CN108975788A CN201811002091.7A CN201811002091A CN108975788A CN 108975788 A CN108975788 A CN 108975788A CN 201811002091 A CN201811002091 A CN 201811002091A CN 108975788 A CN108975788 A CN 108975788A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Ceramic Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of methods for improving steam-cured complementary cementitious material/cement system intensity, step is: nano silica is mixed with water, ultrasonic disperse is uniform, and obtained nano silicon dioxide dispersion is mixed as mixing water with the component of other cement-based materials, common mix molding；By sample elder generation after molding standard curing, again steam curing, finally carry out standard curing to get finished product.The present invention proposes to use Nano-meter SiO_22The particular form that combines with steam curing promotes steam-cured complementary cementitious material-cement system early strength development, and then shortens the plant produced period, meanwhile, also to overcome the system later strength this persistent ailment that increasess slowly to provide innovative solution.The method of the present invention is easy to operate, can be widely applied to cement concrete field, especially precast concrete engineering field.
Description
Technical field
The present invention relates to a kind of methods for improving steam-cured complementary cementitious material/cement system intensity, in particular to a kind of
Improve the complementary cementitious material/body of cement such as the interior fly ash prepared under the conditions of steam curing or ground granulated blast furnace slag
It is the method for intensity, belongs to building material technical field.
Background technique
As China's traditional infrastructure industry, building materials industry is the foundation stone of the development of the national economy.Currently, with China's economy
Development and environmental protection pressure increase, human resources consumption present in concrete cast-in-situ structural system is big, construction material
Loss is big, construction quality is unstable and the drawbacks such as environmental pollution is serious become clear day by day.In recent years, develop in conjunction with external prefabricated component
The development trend of successful experience and China's building industrialization, concrete structure are prefabricated because having high efficiency, high-quality, low-resource
It consumption and is greatly developed the advantages that low environmental impact.
The factorial production precast concrete generallys use steam curing mode and carries out at present, to improve production efficiency.Together
Shi Caiyong the method for a large amount of complementary cementitious materials is added in cement-based material come reduce cement consumption so that reduce carbon emission,
Reduce production cost.Wherein, common complementary cementitious material has flyash, ground granulated blast furnace slag etc..Flyash is electricity
The solid waste discharged in factory's coal-fired process, since there is shape effect, micro aggregate effect and pozzolanic activity to imitate for itself
It answers, can substantially reduce concrete mixing water consumption, improve concrete workability and other certain technical performances and extensive
Applied to architectural engineering and building material industry；Ground granulated blast furnace slag, is commonly called as slag, be it is a kind of obtained in the blast furnace ironmaking with
Ca aluminosilicate is the fusant of main matter, byproduct obtained from granulating is handled by quenching, because having higher potential activity
A kind of common minerals admixture when often by as configuration concrete.
Early strength be influence the determinant of prefabricated components the factorial production, and can normal use and product property
Later strength can then be depended on to develop.In general, complementary cementitious material volume is higher, the carbon emission of production and use process and at
This is lower, but the intensity of cement-based material is significantly reduced, thus cause plant produced efficiency and properties of product significantly under
Drop.
Many scholars are but strong for the later period the study found that cement-based material early strength can be improved in nano silica
Degree development then even has negative effect without too big contribution.For example, leaf blueness 2001 " New Building Materials " (volume 11,4-8
Page) in study nano combined cement structures material when discovery incorporation Nano-meter SiO_22The system early strength can be significantly improved；Hou
Deng 2012 " building and construction material " (Construction and Building Materials, volume 34,1095-
Page 1103) have studied colloidal nano SiO2(CNS) to the influence of flyash-cement composite material performance, research shows that: early stage,
Nano-meter SiO_22It can be improved the degree of hydration of flyash in the complex cement cementitious material, but stage causes to bear because of package action
Face sound accounts for leading；Wang Liguo et al. thinks the addition of nano material for 2016 in " silicate notification " (volume 35, the 7th phase)
There is the influence being obviously improved Dan Shi for later period mechanical property unobvious system early mechanics characteristics, or even will appear intensity
Retraction.
Some scholars are the study found that add the cement-based material early strength of complementary cementitious material under the conditions of steam curing
Have and be more obviously improved, but later strength then develops slowly.For example, Hu Yizhang's research shows that (" large dosage mine under making condition
The performance study of polymer blends material concrete "), either in the concrete system of flyash in great mixed amount or slag, 80 DEG C of steam
Maintenance all significantly reduces later strength while significantly promoting early strength；(" flyash is in composite gelled material by Zhang Qinghuan
The mechanism of action in hydration process ") it is found when studying the mechanism of action of the flyash in composite gelled material in hydration process
Each test group intensity but its later period strength growth rate are then remarkably decreased High Temperature Curing before 3d age can be improved is -12%.
From the above analysis it can be found that still can be improved steam-cured complementary cementitious material/cement system intensity without one kind
Method.
Summary of the invention
For the deficiencies in the prior art, steam-cured complementary cementitious material/cement is improved the present invention provides a kind of
The method of system intensity, this method use Nano-meter SiO_22The particular form combined with steam curing internally mixes complementary gelling material
The cement-based material of material is handled, it can be made to promote the system early strength to develop and then shorten the same of plant produced period
When be obviously improved its later strength.
The present invention passes through verification experimental verification, and Nano-meter SiO_2 is added2In mix the cement-based material of complementary cementitious material and passing through
Early strength significantly improves after steam curing, this makes the complementary cementitious materials such as flyash, ground granulated blast furnace slag in cement
Addition content in sill can be promoted, and realize raising work while reducing enterprise's production cost and improving plant produced efficiency
Industry salvage value, environmentally protective production target.The present invention innovatively has found simultaneously: the system later strength also has obviously
Promoted, solve problem of the prior art, for overcome steam curing it is resulting in mix complementary cementitious material/cement system later period
Slowly this persistent ailment provides innovative solution for gain in strength.
Based on the studies above, the present invention provides a kind of sides for improving steam-cured complementary cementitious material/cement system intensity
Method, method includes the following steps:
(1) each component of the interior cement-based material for mixing complementary cementitious material is uniformly mixed；
(2) nano silica is mixed with water, ultrasonic disperse is uniform, obtains nano silica aqueous dispersions；
(3) it is mixed using nano silica aqueous dispersions as mixing water with the material of step (1), common mix molding；
(4) by sample after molding according to first standard curing, the maintenance method progress of steam curing, finally progress standard curing again
Maintenance is to get the interior steam curing cement sill finished product for mixing complementary cementitious material.
In the present invention, the steam-cured complementary cementitious material/cement system or the interior steaming for mixing complementary cementitious material
Curing cement sill mixes the cement-based material of complementary cementitious material in referring to obtaining by steam curing mode.In described
The cement-based material for mixing complementary cementitious material refers to the cement-based material that part of cement is replaced with complementary cementitious material.It is described
Complementary cementitious material is material with pozzolanic activity, in addition to cement, including flyash, ground granulated blast furnace mine
Slag, higher territory, natural volcanic ash, zeolite etc..The cement-based material includes precast concrete, cement mortar block, water
Cement paste test block etc., the cement-based material for inside mixing complementary cementitious material are to use the part of cement in these cement-based materials
Complementary cementitious material replaces obtained material.
Further, in the above method, the basic component of the interior cement-based material for mixing complementary cementitious material includes:
Cement (cementitious material), complementary cementitious material can be with according to the performance requirement and application field of different cement-based materials
Aggregate, additive etc., such as water-reducing agent etc. is added.The component of the cement-based material of complementary cementitious material is inside mixed in the prior art
In have sufficient disclosure, and therefore innovative point of the invention is not also here, repeat no more.
Further, it is each to can be the various ratio of muds to the interior steam curing cement sill for mixing complementary cementitious material of the invention
The steam curing cement sill of complementary cementitious material is mixed in kind age.
Further, in the above method, the interior cement-based material for mixing complementary cementitious material disclosed in the prior art
Formula on the basis of, the nanometer titanium dioxide silicon components of the innovative certain content of addition.Nano silica is with aqueous dispersions
Form be added, i.e., be added after being mixed together with mixing water.In practical operation, by the nano silica of formula ratio and match
The mixing water just measured mixes, ultrasonic disperse is uniform, and the steam curing cement sill of complementary cementitious material is then mixed in addition
In other components, mix molding.
Further, in the above method, Nano-meter SiO_22Dosage be cement and complementary cementitious material gross mass 0.1-
3wt%。
Further, in the above method, the addition content of complementary cementitious material is that cement and complementary cementitious material are total
The 10-50wt% of quality, such as 10%, 20%, 30%, 40%, 50%.
Further, the present invention conserves molding sample using steam-cured mode, and maintenance is supported using three sections
Shield mode, advanced row standard curing, then carries out steam curing, finally carries out standard curing.The standard curing is i.e. existing
It is conserved under the recognized standard curing condition in technology.The steam-cured condition is: vapor (steam) temperature is 50-95 DEG C.
Further, altogether for 24 hours, time of first time standard curing is 1-6h, preferably 4h, steam-cured for three sections of maintenances
Time is 5-11h, preferably 7h, and second of standard curing is supplied for 24 hours.
Preferably, it when steam curing, from room temperature to 50-95 DEG C in two hours, is then supported at this temperature
The time of shield, heating and heat preservation is total up to 7h.
Further, standard curing carries out in standard maintenance apparatus, such as standard curing box, and steam curing is supported in steam
It is carried out in shield equipment, such as steam curing box.
The principle of the present invention is: Nano-meter SiO_22Volume can be provided after inside mixing steam-cured complementary cementitious material/cement system
Outer nucleation site, the speed of growth of crystal is conserved higher than room temperature under room temperature-alternate curing temperature of high temperature-room temperature, in turn
Accelerating composite gelled material degree of hydration makes it generate more C-S-H gels, plays compact matrix, improves cement-based material
The effect of mechanical property.After further research, inventor has obtained the theories integration of result of study of the present invention: on the one hand, root
According to formula (1) it is found that during heterogeneous nucleation, Nano-meter SiO_22High temperature steam curing while additional nucleation site is provided
Addition but also nucleation rate increase.
In formula, I is nucleation rate, and A is constant, NTFor nucleation site quantity,G* is critical nucleation free energy, and K is Boltzmann
Constant, T are absolute temperature.
On the other hand, by formula (2) it is found that nanocrystal growth speed with diffusion coefficient and the square root of time ratios just
Correlation, by Arrhenius formula, i.e. formula (3) can calculate, and nanocrystal diffusion coefficient wants high at a high temperature of steam curing
It is conserved in room temperature.
Meanwhile Nano-meter SiO_22It is pozzolanic material with the supplementary cementitious materials such as flyash, ground granulated blast furnace slag,
Pozzolanic reaction can occur with hydrolysis product of cement calcium hydroxide, generate additional C-S-H gel, compact matrix reacts machine
Reason is as the formula:
The present invention is innovatively proposed using Nano-meter SiO_22The particular form combined with steam curing promotes steam-cured complementary glue
Gel material/cement system early strength and later strength development, and then shorten the plant produced period, meanwhile, to overcome the body
It is that later strength this persistent ailment that increasess slowly provides innovative solution.According to existing research, mixed in nano silica
There is no larger positive influences even because of its package cementitious material/cement system later strength complementary under the conditions of standard curing
Effect and there is negative effect, but Nano-meter SiO_2 is combined by the present invention with steam curing mode, more can significantly be improved
The later strength of steam-cured complementary cementitious material/cement system, overcomes technology prejudice, also improves complementary glue in the system
The addition content of gel material, and then improve the utilization rate of industrial waste.The method of the present invention is easy to operate, can be widely applied to cement
Concrete field, especially precast concrete engineering field.Compared with prior art, the invention has the following advantages that
1, environmentally protective.Part of cement is replaced using complementary cementitious material, reduces the mass percent of cement in the system,
Carbon emission amount is reduced, the environmental loads of cement production process is reduced, while increasing complementary cementitious material in cement base
Addition content in material improves the utilization rate of industrial waste in turn.
2, simple process, easy to implement.The production process of very complicated is not needed, it is only necessary to by nanometer during mix
SiO2It mixed in material, then carry out steam curing, it is easy to operate easy to get started.
3, properties of product are excellent.The Nano-meter SiO_2 of admixture2In the case where improving steam curing it is resulting in mix complementary cementitious material
Also have while the early strength of cement-based material accelerates enterprise's production cycle in turn for the system later strength more significant
Promotion.
Specific embodiment
Below will by embodiment, the invention will be further described, these description be not the content of present invention is made into
The restriction of one step.It should be understood by those skilled in the art that equivalent replacement made by the content of present invention, or be correspondingly improved, still
Within belonging to the scope of protection of the present invention.
Embodiment 1
By taking cement mortar block as an example, the method for the present invention effect is verified, steps are as follows:
1, according to 1 parts by weight of cementitious material, 3 parts by weight of normal sand, 0.01 parts by weight of water-reducing agent, Nano-meter SiO_220.01 parts by weight
Proportion weighs each raw material, and wherein cementitious material is the mixture of cement and flyash, and cement accounts for 70%, and flyash accounts for 30%, water ash
Than controlling 0.35.
2, by Nano-meter SiO_22It is added to the water, ultrasonic disperse is uniform, obtains Nano-meter SiO_22Dispersion liquid；
3, cement, flyash, normal sand, water-reducing agent are uniformly mixed, Nano-meter SiO_2 is then added2Dispersion liquid as mixing water into
The molding of row mix；
4, sample after molding is put into standard curing box (temperature is 20 DEG C, relative humidity 95%) interior maintenance 4 hours, then
It takes out and is sent into steam curing box, guarantee that the temperature in steam curing box rises to 70 DEG C from room temperature in 2h, then in 70 DEG C of constant temperature
It conserves 5h, after steam curing, sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%)
Middle maintenance 13h, then demoulds, and obtains cement mortar block, test block is having a size of 160mm*40mm*40mm.
Embodiment 2
Cement mortar block is prepared according to the method for embodiment 1, unlike: flyash is replaced with into ground granulated blast furnace mine
Slag.
Embodiment 3
Cement mortar block is prepared according to the method for embodiment 1, unlike: in cementitious material, the content of cement is 85wt%,
The content of flyash is 15wt%.
Embodiment 4
Cement mortar block is prepared according to the method for embodiment 1, unlike: in cementitious material, the content of cement is 60wt%,
The content of flyash is 40wt%.
Embodiment 5
Cement mortar block is prepared according to the method for embodiment 1, unlike: the step of maintenance, is: sample after molding is put
Enter in standard curing box (temperature is 20 DEG C, relative humidity 95%) maintenance 4 hours, then takes out and be sent into steam curing box, protect
Temperature in card steam curing box rises to 60 DEG C from room temperature in 2h,, will after steam curing then in 60 DEG C of thermostatic curing 5h
Sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%) and conserves 13h, then demoulds, obtains cement
Mortar specimen.
Embodiment 6
Cement mortar block is prepared according to the method for embodiment 1, unlike: the step of maintenance, is: sample after molding is put
Enter in standard curing box (temperature is 20 DEG C, relative humidity 95%) maintenance 4 hours, then takes out and be sent into steam curing box, protect
Temperature in card steam curing box rises to 80 DEG C from room temperature in 2h,, will after steam curing then in 80 DEG C of thermostatic curing 5h
Sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%) and conserves 13h, then demoulds, obtains cement
Mortar specimen.
Embodiment 7
By taking cement mortar block as an example, the method for the present invention effect is verified, steps are as follows:
1, according to 1 parts by weight of cementitious material, 3 parts by weight of normal sand, 0.01 parts by weight of water-reducing agent, Nano-meter SiO_220.01 parts by weight
Proportion weighs each raw material, and wherein cementitious material is the mixture of cement and ground granulated blast furnace slag, and cement accounts for 85%, and granulation is high
Furnace ground slag accounts for 15%, and the ratio of mud is controlled 0.35.
2, by Nano-meter SiO_22It is added to the water, ultrasonic disperse is uniform, obtains Nano-meter SiO_22Dispersion liquid；
3, cement, ground granulated blast furnace slag, normal sand, water-reducing agent are uniformly mixed, Nano-meter SiO_2 is then added2Dispersion liquid is made
Mix molding is carried out for mixing water；
4, sample after molding is put into standard curing box (temperature is 20 DEG C, relative humidity 95%) interior maintenance 4 hours, then
It takes out and is sent into steam curing box, guarantee that the temperature in steam curing box rises to 60 DEG C from room temperature in 2h, then in 60 DEG C of constant temperature
It conserves 5h, after steam curing, sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%)
Middle maintenance 13h, then demoulds, and obtains cement mortar block, test block is having a size of 160mm*40mm*40mm.
Embodiment 8
By taking cement mortar block as an example, the method for the present invention effect is verified, steps are as follows:
1, according to 1 parts by weight of cementitious material, 3 parts by weight of normal sand, 0.01 parts by weight of water-reducing agent, Nano-meter SiO_220.01 parts by weight
Proportion weighs each raw material, and wherein cementitious material is the mixture of cement and flyash, and cement accounts for 60%, and flyash accounts for 40%, water ash
Than controlling 0.35.
2, by Nano-meter SiO_22It is added to the water, ultrasonic disperse is uniform, obtains Nano-meter SiO_22Dispersion liquid；
3, cement, flyash, normal sand, water-reducing agent are uniformly mixed, Nano-meter SiO_2 is then added2Dispersion liquid as mixing water into
The molding of row mix；
4, sample after molding is put into standard curing box (temperature is 20 DEG C, relative humidity 95%) interior maintenance 4 hours, then
It takes out and is sent into steam curing box, guarantee that the temperature in steam curing box rises to 60 DEG C from room temperature in 2h, then in 60 DEG C of constant temperature
It conserves 5h, after steam curing, sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%)
Middle maintenance 13h, then demoulds, and obtains cement mortar block, test block is having a size of 160mm*40mm*40mm.
Embodiment 9
By taking cement mortar block as an example, the method for the present invention effect is verified, steps are as follows:
1, according to 1 parts by weight of cementitious material, 3 parts by weight of normal sand, 0.01 parts by weight of water-reducing agent, Nano-meter SiO_220.01 parts by weight
Proportion weighs each raw material, and wherein cementitious material is the mixture of cement and ground granulated blast furnace slag, and cement accounts for 60%, and granulation is high
Furnace ground slag accounts for 40%, and the ratio of mud is controlled 0.35.
2, by Nano-meter SiO_22It is added to the water, ultrasonic disperse is uniform, obtains Nano-meter SiO_22Dispersion liquid；
3, cement, ground granulated blast furnace slag, normal sand, water-reducing agent are uniformly mixed, Nano-meter SiO_2 is then added2Dispersion liquid is made
Mix molding is carried out for mixing water；
4, sample after molding is put into standard curing box (temperature is 20 DEG C, relative humidity 95%) interior maintenance 4 hours, then
It takes out and is sent into steam curing box, guarantee that the temperature in steam curing box rises to 80 DEG C from room temperature in 2h, then in 80 DEG C of constant temperature
It conserves 5h, after steam curing, sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%)
Middle maintenance 13h, then demoulds, and obtains cement mortar block, test block is having a size of 160mm*40mm*40mm.
Embodiment 10
Cement mortar block is prepared according to the method for embodiment 1, unlike: Nano-meter SiO_22Dosage be 0.001 parts by weight.
Embodiment 11
Cement mortar block is prepared according to the method for embodiment 1, unlike: Nano-meter SiO_22Dosage be 0.03 parts by weight.
Embodiment 12
Cement mortar block is prepared according to the method for embodiment 1, unlike: the step of maintenance, is: sample after molding is put
Enter in standard curing box (temperature is 20 DEG C, relative humidity 95%) maintenance 4 hours, then takes out and be sent into steam curing box, protect
Temperature in card steam curing box rises to 50 DEG C from room temperature in 2h,, will after steam curing then in 50 DEG C of thermostatic curing 5h
Sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%) and conserves 13h, then demoulds, obtains cement
Mortar specimen.
Embodiment 13
Cement mortar block is prepared according to the method for embodiment 1, unlike: the step of maintenance, is: sample after molding is put
Enter in standard curing box (temperature is 20 DEG C, relative humidity 95%) maintenance 3 hours, then takes out and be sent into steam curing box, protect
Temperature in card steam curing box rises to 95 DEG C from room temperature in 2h,, will after steam curing then in 95 DEG C of thermostatic curing 8h
Sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%) and conserves 11h, then demoulds, obtains cement
Mortar specimen.
Comparative example 1
1, each raw material is weighed according to the proportion of 1 parts by weight of cementitious material, 3 parts by weight of normal sand, 0.01 parts by weight of water-reducing agent, wherein
Cementitious material is the mixture of cement and flyash, and cement accounts for 70%, and flyash accounts for 30%, and the ratio of mud is controlled 0.35.
2, cement, flyash, water-reducing agent are uniformly mixed, pure water is then added and carries out mix molding；
4, sample after molding is put into standard curing box (temperature is 20 DEG C, relative humidity 95%) interior maintenance 4 hours, then
It takes out and is sent into steam curing box, guarantee that the temperature in steam curing box rises to 70 DEG C from room temperature in 2h, then in 70 DEG C of constant temperature
It conserves 5h, after steam curing, sample taking-up is fed again into standard curing box (temperature is 20 DEG C, relative humidity 95%)
Middle maintenance 13h, then demoulds, obtains cement mortar block.
Intensity test
Test above-described embodiment by GB/T 17671-1999 and cement mortar block that comparative example is handled 1d, 3d, 7d,
The compression strength of 28d, as a result as shown in table 1 below.
Can be seen that from the data of embodiment 1-9 has by the method for the present invention treated cement mortar block in 1d
Good compression strength, this illustrates the method for the present invention for mixing the cement-based material of complementary cementitious material in obtained by steam curing
Early strength raising effect it is obvious.Meanwhile the 28d of embodiment 1 and comparative example 1 statistics indicate that: the method for the present invention to improve steam
The later strength effect that the cement-based material of complementary cementitious material is mixed in vapour maintenance gained is also very significant, and intensity improves 1
Grade.
Claims (8)
1. a kind of method for improving steam-cured complementary cementitious material/cement system intensity, it is characterized in that the following steps are included:
(1) each component of the interior cement-based material for mixing complementary cementitious material is uniformly mixed；
(2) nano silica is mixed with water, ultrasonic disperse is uniform, obtains nano silica aqueous dispersions；
(3) it is mixed using nano silica aqueous dispersions as mixing water with the material of step (1), common mix molding；
(4) by sample after molding according to first standard curing, the maintenance method progress of steam curing, finally progress standard curing again
Maintenance is to get the interior steam curing cement sill finished product for mixing complementary cementitious material.
2. according to the method described in claim 1, it is characterized in that: the cement-based material for mixing complementary cementitious material in described refers to
The cement-based material of part of cement is replaced with complementary cementitious material, the complementary cementitious material is with pozzolanic activity
, material in addition to cement, including flyash, ground granulated blast furnace slag, higher territory, natural volcanic ash, zeolite.
3. method according to claim 1 or 2, it is characterized in that: the addition content of complementary cementitious material is cement and auxiliary
The 10-50wt% of helping property cementitious material gross mass.
4. method according to any one of claim 1-3, it is characterized in that: Nano-meter SiO_22Dosage be cement and complementary
The 0.1-3wt% of cementitious material gross mass.
5. method according to any one of claim 1-3, it is characterized in that: vapor (steam) temperature when steam curing is 50-95
℃。
6. according to the method described in claim 5, it is characterized in that: when steam curing, from room temperature to 50-95 in two hours
℃。
7. method according to claim 1 or 5, it is characterized in that: maintenance is total for 24 hours, first time standard curing in step (4)
Time be 1-6h, preferably 4h, the steam-cured time is 5-11h, and the time of preferably 7h, second of standard curing supplies
24h。
8. method according to any one of claims 1-7, it is characterized in that: mixing the cement of complementary cementitious material in described
Sill includes precast concrete, cement mortar block or cement paste test block.
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| CN113563106A (en) * | 2021-07-02 | 2021-10-29 | 广东同创科鑫环保有限公司 | Coal-fired furnace slag cementing material product and steam curing method thereof |
| CN115448680A (en) * | 2022-10-13 | 2022-12-09 | 涉县清漳水泥制造有限公司 | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof |
| CN115504726A (en) * | 2022-09-20 | 2022-12-23 | 安徽理工大学 | Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete |
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| CN110713365A (en) * | 2019-10-18 | 2020-01-21 | 济南大学 | In-situ preparation method of photocatalytic concrete |
| CN110713365B (en) * | 2019-10-18 | 2022-09-02 | 济南大学 | In-situ preparation method of photocatalytic concrete |
| CN113563106A (en) * | 2021-07-02 | 2021-10-29 | 广东同创科鑫环保有限公司 | Coal-fired furnace slag cementing material product and steam curing method thereof |
| CN115504726A (en) * | 2022-09-20 | 2022-12-23 | 安徽理工大学 | Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete |
| CN115504726B (en) * | 2022-09-20 | 2023-09-08 | 安徽理工大学 | Preparation method of slow-release hydrophobic microcapsule and hydrophobic concrete |
| CN115448680A (en) * | 2022-10-13 | 2022-12-09 | 涉县清漳水泥制造有限公司 | Low-carbon rapid demoulding prefabricated part prepared from solid waste base cementing material containing cement, fly ash and desulfurized gypsum and preparation method thereof |
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